Using entanglement to discern phases in the disordered one-dimensional Bose-Hubbard model
1 Department of Physics and Centre for Scientific Computing, The University of Warwick Coventry, CV4 7AL, UK
2 JARA Institute for Quantum Information, RWTH Aachen University - D-52056 Aachen, Germany
Received: 10 March 2015
Accepted: 18 July 2015
We perform a matrix-product-state–based density matrix renormalisation group analysis of the phases for the disordered one-dimensional Bose-Hubbard model. For particle densities , 1/2 and 2 we show that it is possible to obtain a full phase diagram using only the entanglement properties, which come for free when performing an update. We confirm the presence of Mott insulating, superfluid and Bose glass phases when and 1/2 (without the Mott insulator) as found in previous studies. For the system we find a double-lobed superfluid phase with possible re-entrance.
PACS: 61.43.-j – Disordered solids / 05.30.Jp – Boson systems / 03.75.Gg – Entanglement and decoherence in Bose-Einstein condensates
© EPLA, 2015